Questions about the use of built-in Mathematica functions, including pure functions.
0
votes
0answers
37 views
Representing an interpolating function
I just want to figure out how to "represent" or to inject an interpolating function into a numerical calculation. So, suppose i have an interpolating function $int$ and then i want to use NDSolve or ...
2
votes
1answer
42 views
Creating a bound method (partial function application)
I want to bind arguments to methods (e.g. for use in OOP creating a bound method--what Java just calls a method). I realized this is basically just a partial function application. Now I want to make ...
1
vote
0answers
11 views
Convolve[…] behaves differently to that of Integrate[…] when numerically integrating the result
I am performing a convolution between two functions, and then I want to numerically integrate the result.
If I go:
...
0
votes
0answers
50 views
Constructing a user function with an integral
Maybe this is a basic task to perform but I haven't found any literature. I am performing a convolution of two functions:
...
0
votes
1answer
32 views
Are there any built-in functions to calculate CIE color matching functions?
I know there are some functions to work with XYZ color space, e.g. XYZColor, ColorConvert etc.. But I couldn't find any ...
0
votes
2answers
37 views
Problem in dealing with Sign function
Let my function be $f(x)=e^{|x|}$.
I wish to find $f''(x)$, this can be done as-
$f'(x)=$sgn$(x)e^{|x|}$
$f''(x)=$sgn$(x)^2e^{|x|} =e^{|x|}$
In Mathematica, I am trying to plot $f''(x)$, it ...
2
votes
1answer
68 views
Recall the names of functions used in a long MMA code
Suppose you have a very long code in which many new functions are created. For efficient programming, very short and easily iterated function names are preferred.
...
1
vote
2answers
59 views
Working with complex valued functions
I have a function which has real and imaginary parts and I need to differentiate both parts separately. This is a simpler example of what I have tried, without success:
...
0
votes
1answer
39 views
Relations between Function Variables in Computations
I have the relation λ=c/f, respectively f=c/λ and a simple function n[λ_]:=λ²+1. I'd like to differentiate the function with respect to f, then plot it as a function of λ again. For this, I can define ...
1
vote
1answer
64 views
need help with remembering a name of a function
I have an output cell and want to see the input that led to that output. How do I tell Mathematica to display that input?
1
vote
0answers
36 views
Help Simplifying Expressions
I have the following set of equations:
1)
$\text{$b_1$} \cos (\text{$\beta_1$} u)-\text{$b_1$} \cosh (\text{$\beta_1$} u)-\text{$b2$} \cos (\text{$\beta_1$} \theta y)-\text{$d_2$} \cosh (\text{$\...
2
votes
1answer
57 views
1
vote
1answer
38 views
0
votes
0answers
18 views
Raising a negative number to a fractional power, why the result is different? [duplicate]
In the math theory, we know have
$$(x)^{\frac{m}{n}=}\sqrt[n]{x^m} \ ,$$
it means
$$(-1.5)^{\frac{1}{0.3}}=(-1.5)^{\frac{10}{3}}=\sqrt[3]{(-1.5)^{10}}=\sqrt[3]{1.5^{10}}\simeq 3.8634 \ .$$
But in ...
1
vote
1answer
34 views
How to define a variable to be a function of all the arguments but one?
I have several variables (coordinates) $x_1, x_2, x_3, x_4, z$ and a lot (21, to be precise) functions $g_i$ which are assumed to depend on $x_1, x_2,x_3, x_4$, but not on $z$. I also have a ...
0
votes
1answer
52 views
Defined function doesn't plot correctly
I have defined a function that produces a single negative impulse spanning -b to -a and a positive impulse spanning ...
0
votes
0answers
24 views
Functional Relationship Between Variables in Plots
I am looking for a way to plot a function of a variable against another variable, whoch is a function of the first variable.
If I try, for example, the function $f=v^{10}$ with the variable $v$
<...
3
votes
1answer
57 views
How to create a function that eliminates repeated elements
I want to create a function that eliminates repeated elements from a list without changing the order.
For example:
...
0
votes
1answer
48 views
4
votes
1answer
64 views
MeshRefinementFunction for region gives error
I would like to refine a mesh within a given path/volume, that is specified by the MeshRefinementFunction option given in ToElementMesh[].
For starting i took a simple 3D MeshRegion of a Tetrahedron
<...
0
votes
1answer
59 views
Using of functions and lists from other Mathematica files
I have a code in which I have to use some functions and lists and use them in the body of the code. If I want to type all of them in a file in Mathematica, that file becomes very very long. For ...
2
votes
1answer
34 views
How to declare derivatives of a multivariable function as real in order to get Re and Im part of the expression?
Re and Im work properly, with appropriate assumptions, in the example like this
...
1
vote
2answers
75 views
I want to set $x = \{x_1, x_2, \cdots, x_n\}$
I want to get $\{x_1, x_2, \cdots, x_n\}$.
I want to use the $x_i$ as a variable.
The following code did't work.
...
1
vote
2answers
82 views
For loop not working as expected from a C programmer's perspective [closed]
Why does Print[n] produce output inside a For loop, while Sqrt[n] (as well as many other ...
5
votes
3answers
91 views
Constructing possibilities of a generating function
I want to find all the possible ways that 4 variables can be summed to a given number. Suppose I have the variables
$$x=x_0+x_1+x_2+x_3$$
I want to fill $x_0,x_1,x_2$ and $x_3$ such that $x_0$ and $...
2
votes
2answers
53 views
Construct a function like Coefficient
I'am trying to construct a function that will work like Coefficient as an exercise.
...
0
votes
0answers
26 views
How to find ranges of values where specific conditions are true?
I'm trying to get Mathematica to solve a particular inequality in terms of the variables (and constants) of interest to find where the inequality holds as true. Specifically, I have three functions of ...
1
vote
1answer
58 views
Constuct a function that plus equations
I want to construct a function that plus equations.
For example:
SomaEqns[eq1,eq2,...] == eq1 + eq2 + ...
It's possible do that with recursive way? Using less ...
3
votes
1answer
96 views
Functionalize fit
Simple question, suppose I want to fit data and use
Fit[data, {x^4, x^3, x^2, x, 1}, x]
I want to convert the output of fit into a function I can later use.
...
5
votes
2answers
159 views
Efficiently Evaluate a Multivariable Function on a List of Tuples
I have a function G[x,y,z,r,s,t] in the code below. Quite simply, I want to generate a list of all possible tuples $(x,y,z,r,s,t)$ such that all six entries are ...
6
votes
1answer
73 views
How can I update an association with a function?
I'm not sure if this is a bug, or if I just am not understanding, properly, how to create a function.
I am able to use a list of rules to update an association like so:
...
2
votes
1answer
101 views
How to compute many sums or tables efficiently
I have some questions about programming in Mathematica and I would really appreciate it if you could help me.
I wish to plot the following function against the variable X, but to do this, first I ...
2
votes
1answer
45 views
Get the name of symbol inside a function [duplicate]
I have a list t1Funcsv0={0.10000000000, 1.00000*10^-7} and I have a function
...
6
votes
0answers
63 views
What is the philosophy behind \[Rule] (a.k.a. `->`) for assigning options?
Today I was banging my head against my desk when I realized that the problem I was experiencing was due to having typed
ImageSize[Large]
instead of
...
7
votes
2answers
322 views
Evaluate Only Part of a Function
I have a list of functions, each containing none or more of the functions Plus, Times, ...
3
votes
2answers
32 views
How to use an imported table data in a calculation of f[x,y,z], where each row of the column correspond to x,y,z? [duplicate]
I have a table with desired inputs of a given function efvc[n,m,u]. I want to calculate for different values of n, ...
2
votes
1answer
25 views
AssociateTo with a variable as an argument produces error
The following code:
list=Table[<\"number"->i|>,{i,1,100}];
list[[20]]["number"]
list[[1]]
AssociateTo[list[[1]],"number"->101];
list[[1]]
Results in....
16
votes
1answer
173 views
How can I view the minimal required arguments of a Wolfram Language function?
This question might be a bit of an overstretch, or really obvious, but I haven't been able to find an answer yet.
Is there a way to automatically view the minimum required arguments for a WL function?...
6
votes
2answers
76 views
Simplifying boolean algebra without using certain operations
when I use Simplify or FullSimplify in Mathematica it often simplifies it using all the existing boolean operations. For example,...
2
votes
1answer
44 views
How to manipulate an equation so that it is in terms of a certain variable
For example, I have an equation
$$z = \frac{(1+a)}{(1+b)} + 3x + 4y^2$$
I have a new variable where $$R = \frac{(1+a)}{(1+b)}$$
Is there a function or code where I can tell Mathematica to ...
13
votes
2answers
353 views
How to build a list of elements satisfying a certain property without building a list of all elements first?
Is there a way to directly build a list of elements that satisfy a certain property? More precisely, I am looking for a function IncludeIf (this is a placeholder ...
1
vote
3answers
53 views
Prime number counting function
As part of an assignment for a calculus class, I have to write code for the prime number counting function $p(n)$, I have no problem creating the function itself, but for I want it as a function, ...
1
vote
2answers
122 views
Why Mathematica does nothing with the expression Gamma[2 z]? [closed]
Could someone tell me why Mathematica just returns the input with this expression:
Gamma[2z]
Gamma[2 z]
?
I expected this result:
$Γ(2z)=\frac{2^{2z-1}Γ(z)Γ(...
7
votes
1answer
129 views
Checking what a function depends on
I'd like to define specific partial derivative operators that change based on if the passed expression is a function of, for example, x vs. ...
0
votes
2answers
50 views
3
votes
2answers
113 views
“Re-writing” the function `MemberQ`
I am trying to program the function MemberQ using less then possible functions pre defined by Mathematica.
Until this now my code is:
...
0
votes
0answers
45 views
How to create the function `ArrayQ`?
I want to create my own function ArrayQ. For example, I already create the function VectorQ:
...
0
votes
0answers
24 views
How to create my own function `KeyFreeQ`?
I want to create my own function KeyFreeQ. For example, I already create some functions (IntegerQ,EvenQ,OddQ,PrimeQ):
...
1
vote
0answers
54 views
Discrete-to-Continuous Function in Mathematica? [closed]
Inspired by this link on SE Math, I began to wonder if Mathematica has a function that attempts to convert a discrete function into a continuous one?
7
votes
1answer
58 views
Function defined in a package behaves differently from when defined in a notebook
On a Windows system I'm using the Rubi rule-based integration package by Albert Rich which defines function "Int" in addition to Mathematica's Integrate. In my ..\ProgramData\kernel\init.m I have:
<...
